Hello from Europe!
I have Deye SUN-12K-SG04LP3-EU three phase 12kW hybrid inverter and want to build couple of battery packs for it. I've spent many nights on reading, have formed some opinions, but there are still some unknowns. Would be great to get some help from more experienced guys.
TL;DR version:
* which fuses should I buy in Europe for 60A 250A?
* which connectors should I use for connecting/disconnecting the battery packs?
* where can I buy genuine JK BMS?
Long version:
Inverter supports 40~60 V batteries and has charging/discharging current of 240A. I'd like to be able to fully utilize it. The current seems to be a bit large, so I've decided to build two 16S battery packs and use them in parallel. I'm going to use 50mm² wires for connecting everything, their specification state that they can be used for up to 274A continuously, should be enough.
Unless something goes wrong, I'm going to use LF280K cells. I've already ordered them, they should be delivered in a month or so.
For the protection, I'm going to use some kind of fuse. Haven't decided which fuse to use. It might be either Class T from amazon.com ($45 for holder, $40 for the fuse, + shipping, + taxes?), or something cheaper that would be available in Europe. I'm bad at finding the right fuses, there seem to be too many types of them (I do know that ANL fuses from aliexpress is going to be a bad choice), so might as well just go with Class T from Blue Sea Systems and/or Littelfuse from amazon.com, I hope they will never trip and I won't need to buy them again
I don't trust DC breakers from aliexpress, but the ones from well known brands that I was able to find were rather expensive. My current plan is to skip using DC breaker and leave handling accidental slight overloads to the fuse…
For connecting/disconnecting the battery packs, I might be using Anderson SB175 connectors. That way, I would be able to quickly disconnect them (no need for a switch). Or, perhaps, there are better connectors? I've never used any connectors with such large currents, Anderson was chosen only because I saw it being mentioned in this forum.
Now for the BMS… From what I understood, there are three main brands - Daly, JK and JBD. While I have seen some comments about failing JK, they seem to be repairable, whereas Daly seems to have much more issues (or is it just much more popular?) and seems to be harder to repair. I don't really remember why I chose not to use JBD.
My initial plan was to get 250A Daly BMS - they have 125A charging current, 250A discharging, perfect for my needs. Though, after seeing all those comments about issues with Daly, I think it would make more sense to get the JK BMS. Probably something with 2A balancing current and 200A charging/discharging current (unless there's something from JK with 250A or 300A charging/discharging current).
Where can I buy JK BMS that would not be fake/scam? Is https://vi.aliexpress.com/item/1005006014535487.html the right store on aliexpress? It says "Pre-order", "Releases on Oct 20", can we trust it? Or has it been already postponed several times?
I have Deye SUN-12K-SG04LP3-EU three phase 12kW hybrid inverter and want to build couple of battery packs for it. I've spent many nights on reading, have formed some opinions, but there are still some unknowns. Would be great to get some help from more experienced guys.
TL;DR version:
* which fuses should I buy in Europe for 60A 250A?
* which connectors should I use for connecting/disconnecting the battery packs?
* where can I buy genuine JK BMS?
Long version:
Inverter supports 40~60 V batteries and has charging/discharging current of 240A. I'd like to be able to fully utilize it. The current seems to be a bit large, so I've decided to build two 16S battery packs and use them in parallel. I'm going to use 50mm² wires for connecting everything, their specification state that they can be used for up to 274A continuously, should be enough.
Unless something goes wrong, I'm going to use LF280K cells. I've already ordered them, they should be delivered in a month or so.
For the protection, I'm going to use some kind of fuse. Haven't decided which fuse to use. It might be either Class T from amazon.com ($45 for holder, $40 for the fuse, + shipping, + taxes?), or something cheaper that would be available in Europe. I'm bad at finding the right fuses, there seem to be too many types of them (I do know that ANL fuses from aliexpress is going to be a bad choice), so might as well just go with Class T from Blue Sea Systems and/or Littelfuse from amazon.com, I hope they will never trip and I won't need to buy them again
I don't trust DC breakers from aliexpress, but the ones from well known brands that I was able to find were rather expensive. My current plan is to skip using DC breaker and leave handling accidental slight overloads to the fuse…
For connecting/disconnecting the battery packs, I might be using Anderson SB175 connectors. That way, I would be able to quickly disconnect them (no need for a switch). Or, perhaps, there are better connectors? I've never used any connectors with such large currents, Anderson was chosen only because I saw it being mentioned in this forum.
Now for the BMS… From what I understood, there are three main brands - Daly, JK and JBD. While I have seen some comments about failing JK, they seem to be repairable, whereas Daly seems to have much more issues (or is it just much more popular?) and seems to be harder to repair. I don't really remember why I chose not to use JBD.
My initial plan was to get 250A Daly BMS - they have 125A charging current, 250A discharging, perfect for my needs. Though, after seeing all those comments about issues with Daly, I think it would make more sense to get the JK BMS. Probably something with 2A balancing current and 200A charging/discharging current (unless there's something from JK with 250A or 300A charging/discharging current).
Where can I buy JK BMS that would not be fake/scam? Is https://vi.aliexpress.com/item/1005006014535487.html the right store on aliexpress? It says "Pre-order", "Releases on Oct 20", can we trust it? Or has it been already postponed several times?